import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
			int n = Integer.parseInt(br.readLine());
			int sum = 0;

			if (n % 2 == 0) {
				while (n > 0) {
					sum += (int) (1 * Math.pow(10, (n - 1)/ 2));
					n -= 2;
				}
			}
			else {
				sum += (int) (7 * Math.pow(10, (n - 2)/ 2));
				n -= 3;
				while (n > 0) {
					sum += (int) (1 * Math.pow(10, (n - 1)/ 2));
					n -= 2;
				}
			}
			
			System.out.println(sum);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}